It's about power and control. He can choose the one SB that he fancies. With money, he can pick the woman. And try out different women. Different backgrounds, different cultures, different looks.
I see it all over the world when I have traveled.
And even though it's supposed to be mutual, he gets to judge each woman very highly to determine if she is really worth his time and $$. ( I know someone like this. He seems like a decent accomplished polished man, but every once in a while he says something that lets it slip what he is really thinking)